| Completely Engineered Solutions Limited | Birmingham | 2017 |
| Completely EOT Limited | Guildford | 2024 |
| Completely Money Ltd | Glasgow | 2019 |
| Completus Property Ltd | Scarborough | 2025 |
| Complex Care Ltd | Wolverhampton | 2023 |
| Complex Developments Limited | London | 2011 |
| Complexity Consulting Limited | Greater London | 2021 |
| Compliance Alliance Limited | Witham | 2022 |
| Compliance Bureau Limited | Wedmore | 2025 |
| Compliance College Ltd | Knaresborough | 2020 |
| Compliance Consultancy (Services) Limited | Monmouth | 2013 |
| Compliance Facilities Management Ltd | Birmingham | 2019 |
| Compliance Projects Limited | Wirral | 2013 |
| Complii Group Holdings Limited | London | 2025 |
| Complii Group Limited | London | 2025 |
| Complii Holdings Limited | London | 2025 |
| Complii Limited | London | 2025 |
| Complinet Group Limited | London | 2008 |
| Complinet USA Holdings Limited | London | 2000 |
| Comply Direct Limited | Preston | 2023 |
| Componeer Ltd | London | 2024 |
| Component Distributors (Holdings) Limited | Newtownabbey | 1985 |
| Component Distributors Group Limited | Newtownabbey | 2008 |
| Component Moulders Limited | Worthing | 1968 |
| Component Parts Limited | West Midlands | 2002 |
| Components UN Limited | Swansea | 2013 |
| Components Worldwide Limited | Stockport | 2006 |
| Comportment in Safety Ltd | Aberdeen | 2019 |
| Composite Armourtech Ltd | Coleraine | 2011 |
| Composite Corrosion Prevention Limited | London | 2010 |
| Composite Door Suppliers Ltd | Bristol | 2025 |
| Composite Doors Yorkshire Limited | Huddersfield | 2012 |
| Composite Holdings Limited | Harrogate | 2026 |
| Composite Integrity Solutions Limited | Tenterden | 2003 |
| Composite Mind Ltd | Princes Risborough | 2007 |
| Composite Rigging Limited | Southampton | 1998 |
| Composite Sales Limited | Colchester | 2022 |
| Composite Windows Yorkshire Limited | Huddersfield | 2015 |
| Compost-A-Box Ltd | Littlehampton | 2018 |
| Composure Consulting Limited | Billingshurst | 2012 |
| Compound Audio Limited | Bournemouth | 2005 |
| Compressor Engineering Solutions Ltd | Northampton | 2009 |
| Compsal Ltd | Birmingham | 2018 |
| Compsec Marine Limited | Woodford Green | 1978 |
| Comptoir Bath Limited | London | 2014 |
| Comptoir Exeter Limited | London | 2014 |
| Compton Aggregates Limited | Swindon | 1978 |
| Compton Care Limited | Waterlooville | 2008 |
| Compton Commercials Ltd | Exeter | 2014 |
| Compton Terrace Estates Limited | Oxford | 2007 |
| Compton Terrace Limited | Oxford | 2007 |
| Compton Terrace Properties Limited | Oxford | 2007 |
| Comptonia Nominees Limited | | 1928 |
| Comptons Developments Limited | Leighton Buzzard | 2007 |
| Compu-Dec Limited | Portland | 1998 |
| Compucounts Limited | Essex | 1994 |
| Compudrip Limited | Sevenoaks | 2016 |
| Compufix Limited | Hatfield | 1990 |
| Compupeople Limited | Mill Hill | 2000 |
| Compusec Limited | London | 2016 |
| Compusoft Business Software Ltd | Saltash | 2013 |
| Computacenter (FMS) Limited | Hatfield | 1999 |
| Computacenter (Management Services) Limited | Hatfield | 1999 |
| Computacenter (Mid-Market) Limited | Hatfield | 1997 |
| Computacenter Distribution Limited | Hatfield | 1986 |
| Computacenter Leasing Limited | Hatfield | 1989 |
| Computacenter Maintenance Limited | Hatfield | 1988 |
| Computacenter Overseas Holdings Limited | Hatfield | 1997 |
| Computacenter Quest Trustees Limited | Hatfield | 1999 |
| Computacenter Services Limited | Hatfield | 1988 |
| Computacenter Software Limited | Hatfield | 1989 |
| Computacenter Solutions Limited | Hatfield | 1998 |
| Computacenter Training Limited | Hatfield | 1989 |
| Computacenter Trustees Limited | Hatfield | 1998 |
| Computadata Limited | Hatfield | 1983 |
| Computastat Group Limited | Bristol | 1988 |
| Compute Capital SPV Nominees Ltd | London | 2026 |
| Computer Centres (UK) Limited | Wirral | 1993 |
| Computer Consumable Industries Limited | London | 2008 |
| Computer Disposals Limited | Bedford | 2000 |
| Computer Eyes Limited | Dartford | 2014 |
| Computer Gear Limited | Halesowen | 2016 |
| Computer Salvage Specialists Limited | Newbury | 2009 |
| Computer Services Group Limited | Hatfield | 1981 |
| Computer Systems for Business Ltd | Hindhead | 2003 |
| Computer Systems Intelligence Ltd | Oswestry | 2014 |
| Computer Trix Ltd. | Glasgow | 1998 |
| Computers by Post Limited | Sheffield | 1996 |
| Computers Ltd | London | 2002 |
| Computers UN Limited | Swansea | 2013 |
| Comradis Limited | Bollington | 2013 |
| Comres Property Limited | York | 2016 |
| Comrie Freeholdings Limited | Coventry | 2002 |
| Comserv Projects Limited | Havant | 2013 |
| Comstock (Kilmarnock) Ltd. | Glasgow | 1996 |
| Comtech E & I Limited | Newcastle Upon Tyne | 2019 |
| Comtek Distribution Ltd. | London | 2002 |
| Comveco Limited | Stourbridge | 2010 |
| Comvergence Limited | Hereford | 2009 |
| Comwrap Reply Limited | London | 2025 |